Sheet-metal seam.



PATENTED NOV. 6

N. P. SJOBRING. SHEET METAL $EAM.

APPLICATION FILED DEO.4.1905.

UNITED sr rEs PATENT oi rion.

HEET-METAL sEAm.

Specification of Letters Patent.

Patented. Nov. 6, 190a.

A li ti n fil d December 4, 1905. Serial No. 290.302.

is the production of inter ocking means or seams for securing the meeting edges of sheetmetal plates constructed and arranged to provide a positive lock and prevent independent lateral movement of the plates.

The invention is designed, primarily, for

uniting sheet-metal edges in practically any metallic construction, as the seam described provides for joining of sheets of metal so that they will lie in the same plane or at practi cally any desired an le to each other.

The invention wil be described in the following specification, reference being had particularly to the accompanying drawings, in which L Figure 1 is a perspective view, partly sectioned, illustrating the use of my improved seam in forming a window-casing. Fig. 2 is a transverse section through a column, the metallic sheets of which are united by my imroved seam. Fig. 3 is a perspective view illustrating the seam used for joining Sheetmetal plates designed to lieat right angles to each other. Fig. 4 is a transverse section through sheet-metal plates united by my im proved seam and lying in the sameplane. Fig. 5 is a similar view with the sheets lying in offset lanes.

Referring to the drawings, the seam A, forming .the main feature of the invention, is designed to connect any twov sheet-metal plates 1 and 2. The interlocking member of each plate is different, the locking member of plate 1 being hereinafter referred to as the male member of the joint, While the looking member of plate 2 will be hereinafter re ferred to as the female member of the joint. I

With particular reference to plate 1 it will be noted that the locking member comprises a wall 3, extending at right angles to the plane of the plate r the desired distance, and a plate 4, extending at right angles from the wall 3 and in a plane parallel with and un derlying the plate 1. of late 1 therefore comprises a right angle wall and a parallel plate relative to the main plate, providing practically a hook-shaped member. v

Thefemale member of the joint, which is provided on the meeting edge of plate 2, is formed by bending the edge of said plate at a right angle thereto to provide a wall 5, then projecting said extension at a right-angle to said wall to provide an upper plate 6, the latter extending ,from the wall 5 in a direction opposite to the plane of projection of the bent at a right an le to provide an outer wall 7, extending para lel with wall 5 and in the same direction from plate 6 as said wall. From the upper or free end of the wall 7 the material is bent inwardly to provide an upper plate "8, parallel with and extending in the same direction from wall 7 as plate 6. The wall 7, howeverfis of less length than wall 5, so that the lower surface of the plate 8 is on aplane above the lower surface of the ,plate 4. The distance between the plates 6 and 8 of the female member of the'joint is apof the plate 4 of the ma e member, while the distance between the free end of late 8 and will benoted, comprises parallel side walls of unequal lengths and upper and lower plates included between said walls and of unequal plane beyond the edge of the main plate 2.

In assembling the partsof the joint to sevcure the plates to ether the locking members are engaged by longitudinal sliding-movement, the p between t e plates 6 andv 8 of the female 'Inember, while the wall 3 of the male member rests snugly a ainst the wall 5 of the female member an between said wall 5 and the free end of the plate 8, the body of the main plate 1 adjacent its locking member restin against the late 8.

In igs. land 2 t e joint is shown as connecting the plates 1 and 2, designed to form a window-casing or other structure, while in Fig. 2 thejoint is shownas connecting panelstrips for a column or similar structure. In bot these instances the construction preferthe proximate surface of the Wal 5 is equal to the thickness of'the Wall 3. r

The female member oftheilocking-joint, it

lengths, the entire member being formed in a;

ably necessitates that the plane of plate2 be The locking member plate 2. ,From the plate 6 the material is proximately of a size e ual to the thickness I i late 4 of the male member fitting ICO IIO

tion. T e joint in this instance is identical in all features with that described above in detail except. that the wall 5 of the female member is longer than the Wall 3 of the male member, wherebythe plate 2 is positioned in a plane offset from the plane or plate 1.

In Fig. 3 the seam is shown as uniting plates 1 and 2 to project them at a ri ht angle to each other, in which instance t e wall 5 of the female member of the seam is a continuation of and in the plane of the plate 2.

- in Fig. .4 the seam is shown as connecting the plates 1 and 2 so as to arrange them in the same plane, in which event of course the Wall 5 is of a length to aline the plates When the parts are assembled.

- In Fig. 5 the seam is shown as used in connectin the plates so as to arran e them in oil'set ut parallel planes, the wal 5 in this instance being extended to give the desired projection beyond the plane of plate 1.

As the wall 5 of the female member may be arranged at any angle relative to the plane of plate 2, it is obvious that the joint is designed for connecting sheet-metal plates at any angle relative to each other, and this Without change in the slightest degree of the construction of the seam per $6.

In the construction described it will be I noted that the locking members of each plate are formedon the. same side of the reesaeve spective plates and that Whenconnected the Wall 5 oi" the female member serves as a bearing and abutment for the Wall 3 oi the male member, so that any possibility of lateral movement of the parts or disconnection of the lates is prevented.

T e seam described is primarily designed for connecting metal plates in the construction of doors, windows, cabinets, bookcases,

or similar articles; but its use in a variety oi other articles and situations is obvious and is contemplated herein.

Having thus described the invention, what is claimed as new is-- 1 The combination in a metallic structure of two plates having plane surfaces arranged in different parallel planes, each of said lat-es being formed with interlocking hook-sliaped edges arranged to be engaged by the endwise movement of one member relative to the other, one of the plates being provided with an intermediate portion between its plane surface and the interlocking member, said intermediate portion being substantially diagonal to the parallel planes of the respective p ates.

in testimony whereof I affix my signature in presence of two witnesses.

NILS P. sJonniNc.

Witnesses:

JOHN L. FLn'r-cnnn, DAVID W. GOULD. 

